<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			*{
				padding: 0;
				margin: 0;
			}
			body{
				width: 100%;
				height: 727px;
				background-color: rgba(0,0,0,0.7);
				position: absolute;
				font-size: 20px;
				color: cornflowerblue;
				text-align: center;
				line-height: 727px;
			}
			button{
				position: absolute;
				top: 0;
				left: 0;
			} 
			a{
				text-decoration: none;
				color: black;
			}
			
		</style>
	</head>
	<body>
		<button><a href="index.html">开始</a></button>
		
		游戏规则：
		asdw移动，空格发射子弹
	</body>
</html>
